Yes, there is more to learn. Whether learning that extra syntax and semantics will be difficult is hard to say.

What people tend to forget is that the various Apocalyses are short (well, as short as possible to cover the content) technical documents concentrating on all that is new and different in perl6. They are not tutorials.

When the tutorial books and documents get written (I bet merlyn is busy) concepts will be introduced in a more appropriate order. For example, I can see a natural progression from the simple suck-up-an-array style of argument passing to the more complex styles.

Yes, the new arg passing style will need to be learnt by the people need its functionality. But will this be any more effort than learning the various perl5 styles:

Went to join the gridlock to see it
Held an eclipse party
Watched a live feed
I cn"t see tge kwubosd to amswr thus
I tried to see it, but 8000 miles of rock got in the way
What eclipse?
Wanted to see it, but they wouldn't reschedule it
Read the book instead